Two parallel wires each of 4m length having a separation of 5 mm. The magnitude of forces per unit length exerted on each of these wires when they carry a current of 10 A in the same direction and opposite direction respectively are ---------. (Assume μ0 = 4π × 10-7 N/m)
1
8 × 10-3 N, 0N
2
0N, 8 × 10-3 N
3
4 × 10-3 N, 4 × 10-3 N
4
4 × 10-3 N, 0N